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Based on a formal analysis of Grimm’s tales, this paper proposes four typical models of the structure of the sibling group: (1) model of the type (1) + (1), or (1 + 1) + 1 or (xn) + 1. The sibling group is formed of rival subsets. The opposition between the siblings stems from a struggle to obtain the father’s recognition (in the case of brothers) or the mother’s love (in the case of sisters), or integration in the clan of brothers (or sisters) in the case of the model of the type (xn) + 1; (2) model of the type (1 + 1) or (1 + 1 + 1) or (1 + 1 + 1 + 1). The sibling group is united and based on mutual assistance. The group’s solidarity rests on the rejection and mistrust of an adult who is considered as holding absolute power and to have stolen the father or the mother’s love; (3) model of the type 1 = 1, which only pertains to twins. The sibling group is based on identity and a mirror relationship. Here, the identity of form is predominant: the sibling relationship is not constructed, but is part of the natural order; (4) model of the type (1n), or the model of the only child, who has to face the parents’ deception, which stems from the gap between the imaginary child and the real child. The only child is particularly vulnerable to incestuous or symbolic desire for one of the parents in cases where the other parent is not able to play the role of a third party.